专利汇可以提供Appparatus and method for controlling a centrifugal compressor专利检索,专利查询,专利分析的服务。并且In an electric motor driven centrifugal compressor, apparatus and method for controlling the compressor to prevent ''''surge'''' and operation at a motor current above the maximum rated motor current and for automatically restarting the compressor after a short-term power failure. The current to the compressor motor is sensed as an indicator of impending ''''surge''''. When the current falls below a pre-selected minimum value, a blow-off valve in the compressor outlet line is gradually opened to allow excess volume to escape to the atmosphere, thus avoiding ''''surge''''. The current to the motor is also sensed as an indication of compressor operation above the maximum rated motor capacity. When the motor current rises above a pre-selected level, an inlet valve to the compressor is closed. This restricts the volume available for compression and prevents motor over-loaded operation. In the event of a short-term power failure or power dip, contact pairs controlled by time delay relays remain closed for a short period of time. These pairs provide parallel bypass circuits around the normal motor starting circuits and allow an automatic restart if the time period has not been exceeded. The compressor is powered by the flywheel effect of its main drive gear during these shortterm power failures. If the power failure is of a long enough duration, the bypass contact pairs open, and the normal restarting procedures must be followed.,下面是Appparatus and method for controlling a centrifugal compressor专利的具体信息内容。
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